超临界压力锅炉水冷壁倾斜并联内螺纹管内两相流不稳定性的试验研究

针对国产首台600 MW超临界机组在亚临界压力条件下的水动力特性,进行了倾斜并联内螺纹管内的汽液两相流不稳定性试验研究,观察到压力降型和密度波型两种类型的脉动。探讨了影响不稳定性的主要参数。并给出了发生不稳定性的阈值。试验表明:在超临界锅炉滑压运行设计参数条件下,水冷壁管内不会发生两相流不稳定性。图11表1参7

Experimental Study on the Instability of Two-Phase Flow in Parallel Inclined Rifled Water Wall Tubes of Super Critical Pressure Boilers

For the purpose of disclosing the hydrodynamic flow characteristics,under subcritical conditions,of the first domestic manufactured 600MW supercritical pressure power set,experimental studies on the instability of steam-water two phase flow in parallel inclined rifled tubes were conducted,during which two kinds of pulsations pressure?drooping and density oscillating?have been observed,main parameters that affect instability explored and the threshold value of their appearance found.Experimental results show that,in case the super critical pressure boilers are operating under sliding pressure condition,no two-phase flow instability will occur in the water wall tubes.Figs 11,table 1 and refs 7.